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Texas Instruments LM4140BCM-4.1/NOPB
- Part No.:
- LM4140BCM-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCM-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
LM4140BCM-4.1/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 4.096 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (A grade), and 20 mV typical dropout at 1 mA. It features an enable pin for power management and supports precision DAC reference, strain gauge excitation, and portable instrumentation.
For engineers reviewing the LM4140BCM-4.1/NOPB datasheet, LM4140BCM-4.1/NOPB pinout, LM4140BCM-4.1/NOPB application, or LM4140BCM-4.1/NOPB equivalent, key selection criteria include output stability under load variation, ultra-low 2.2 µVPP (0.1–10 Hz) noise, shutdown current ≤1 µA, and compatibility with 1-µF output capacitor for loop stability.
Technical Context
The LM4140BCM-4.1/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 4.096 V output with 3 ppm/°C drift over 0°C to 70°C. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) while maintaining regulation.
It integrates active output capacitor discharge during disable mode, achieving VREF turn-off in <200 µs and full recovery in <200 µs. The enable input accepts logic-level control (VH ≥ 0.8×VIN, VL ≤ 0.4 V), and requires no external pull-up when tied to VIN for always-on operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.1% (initial accuracy at 25°C); enables 12-bit full-scale DAC reference without scaling. |
| Tempco (A Grade) | 3 ppm/°C over 0°C to 70°C; ensures ≤0.87 mV total drift across industrial ambient range. |
| Dropout Voltage | 20 mV (typical) at 1 mA; allows stable operation from 4.116 V supply-critical for single-cell Li-ion or low-voltage rail systems. |
| Output Noise | 2.2 µVPP (0.1–10 Hz); directly limits effective resolution in 24-bit delta-sigma ADC front-ends. |
| Supply Current | 265 µA (typical) active, ≤1 µA shutdown; extends battery life in portable data loggers and handheld meters. |
| Load Regulation | 5 ppm/mA (25°C), 150 ppm/mA (0°C–70°C); maintains accuracy across 1–8 mA load variations in sensor biasing. |
| Line Regulation | 20 ppm/V (25°C) for VIN ≥ VREF + 200 mV; rejects ripple on noisy DC-DC outputs feeding precision analog circuits. |
Pinout & Package
LM4140BCM-4.1/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. Pin functions are validated per TI SNVS053F Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Ground return path for reference core, enable logic, and output stage; all four pins must be connected to system ground plane. |
| 2 | VIN | Positive supply input; minimum operating voltage = 4.116 V (4.096 V + 20 mV dropout); accepts up to 5.5 V. |
| 3 | Enable | Digital control input; high = normal operation (VH ≥ 0.8×VIN), low = shutdown (VL ≤ 0.4 V); internal pull-down absent-must not float. |
| 5 | NC | No-connect terminal; must remain unconnected and unstubbed to avoid parasitic coupling or EMI susceptibility. |
| 6 | VREF | Precision output terminal; sources up to 8 mA; requires 1-µF ceramic/tantalum capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C tempco and 0.1% initial accuracy without laser trimming-reducing unit cost and improving batch consistency. |
| Active output discharge | Internally sinks output capacitor charge during disable, preventing voltage hold-up and enabling fast system power sequencing. |
| Low-noise architecture | 2.2 µVPP (0.1–10 Hz) noise floor supports 24-bit ADCs without external filtering; spectral density scales linearly with VREF. |
| Sub-bandgap output | 4.096 V option enables direct interface with 12-bit DACs using VREF = VDD/2 or VDD/4 scaling-eliminating resistive dividers and associated errors. |
| Ultra-low shutdown current | ≤1 µA max at 70°C allows multi-year battery operation in wireless sensor nodes with periodic wake-up cycles. |
Applications
| Strain Gauge Excitation | Precision DAC Reference |
|---|---|
Use Scenario: Powering a 350-Ω Wheatstone bridge in load cell or pressure transducer modules. IC Role / Device Role / Timing Role: Stable 4.096 V excitation source referenced to ADC's VREF pin to maximize ratiometric measurement accuracy. Use Value: 3 ppm/°C tempco and 0.1% initial accuracy limit bridge output error to <0.01% FS over temperature-meeting Class C industrial scale requirements. |
Use Scenario: Providing reference voltage for 12- or 16-bit DACs in programmable current sources and calibration equipment. IC Role / Device Role / Timing Role: Primary voltage reference establishing full-scale output of DAC; directly connected to REF pin with minimal trace length. Use Value: 2.2 µVPP noise ensures DAC output SNR > 108 dB, preserving resolution in metrology-grade signal generation. |
| Battery-Powered Data Logger | Medical Sensor Biasing |
Use Scenario: Supplying reference for ADCs and analog front-ends in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Low-power, high-stability reference enabling continuous 24-hour monitoring on coin-cell or LiPo battery. Use Value: 265 µA active current and ≤1 µA shutdown current extend battery life to >3 years in sleep-dominated duty cycles. |
Use Scenario: Biasing photodiode transimpedance amplifiers and thermistor interfaces in patient monitoring devices. IC Role / Device Role / Timing Role: Precision voltage source for setting gain, offset, and bias points in analog signal conditioning chains. Use Value: Load regulation of 5 ppm/mA ensures stable sensor excitation despite varying amplifier quiescent currents across operating modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040IDR | 4.096 V, 0.05% initial accuracy, 3 ppm/°C, 3.8 µVPP noise, SOIC-8, 1.2 mA supply current | Higher accuracy and lower noise but 5× higher quiescent current; unsuitable for µA-level battery systems | Select when absolute initial accuracy dominates over power; verify thermal derating for 70°C ambient. |
| ADR444BRZ | 4.096 V, 0.04% initial accuracy, 1.5 ppm/°C, 1.5 µVPP noise, SOIC-8, 750 µA supply current, no enable pin | Superior tempco and noise, but lacks enable functionality and draws >2× more current; fixed ON-state only | Choose for lab-grade instrumentation where power is secondary to drift performance; requires external MOSFET for shutdown. |
Compared with LM4140BCM-4.1/NOPB, REF5040IDR trades 5× higher supply current for tighter initial tolerance, while ADR444BRZ eliminates enable control to achieve lower drift and noise-making LM4140BCM-4.1/NOPB optimal for portable, enable-controlled, low-power precision systems.
Availability
LM4140BCM-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor modules, and industrial data acquisition systems requiring stable component supply, long-term calibration integrity, and low-quiescent-power voltage references.
Supply support for LM4140BCM-4.1/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs since 1951.
The LM4140 series was designed specifically for high-accuracy, low-power, enable-capable voltage references in battery-operated and space-constrained systems-targeting instrumentation, medical, and portable industrial applications.
FAQ
What is the minimum input voltage required for LM4140BCM-4.1/NOPB to regulate at 4.096 V?
The LM4140BCM-4.1/NOPB requires a minimum input voltage of VREF + 20 mV (typical) at 1 mA load, i.e., 4.116 V. At 8 mA load and 70°C, dropout rises to 490 mV, so VIN must be ≥4.586 V for full-range operation. Always maintain VIN ≥ VREF + 400 mV over temperature for guaranteed regulation.
Can LM4140BCM-4.1/NOPB drive a 10-µF output capacitor?
Yes, LM4140BCM-4.1/NOPB supports output capacitors from 0.2 µF to 10 µF, provided ESR falls within the range specified in Figure 24 of the datasheet (SNVS053F). For 10 µF, ESR must be 0.5–5 Ω; tantalum or polymer capacitors meeting this spec ensure stability and transient response.
Does LM4140BCM-4.1/NOPB require an input bypass capacitor?
An input capacitor is not mandatory but strongly recommended: TI specifies a ≥0.1 µF ceramic capacitor close to VIN and GND to suppress supply noise and improve transient response. Without it, line regulation degrades to 350 ppm/V over temperature, compromising accuracy in noisy DC-DC environments.
How does the enable pin behave when left unconnected on LM4140BCM-4.1/NOPB?
The enable pin has no internal pull-up or pull-down. If left floating, LM4140BCM-4.1/NOPB enters an undefined state-potentially oscillating between ON/OFF or latching unpredictably. Always tie EN to VIN for permanent enable or to GND for permanent disable; never leave it open.
What is the maximum output current LM4140BCM-4.1/NOPB can source continuously?
LM4140BCM-4.1/NOPB is rated to source up to 8 mA continuously while maintaining output accuracy and thermal stability. Exceeding 8 mA risks exceeding junction temperature limits (TJMAX = 125°C) and violating load regulation specs-external buffering is required for >8 mA loads.
LM4140BCM-4.1/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 2.2µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.8V ~ 5.5V
- Current - Supply:
- 400µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140BCM-4.1/NOPB FAQ
1.How can I place an order for LM4140BCM-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCM-4.1/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM4140BCM-4.1/NOPB reliable?
The price and inventory of LM4140BCM-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140BCM-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140BCM-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCM-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCM-4.1/NOPB?
LM4140BCM-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCM-4.1/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM4140BCM-4.1/NOPB?
For technical support, including LM4140BCM-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCM-4.1/NOPB requirements.
6.How does Aetrix verify that LM4140BCM-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140BCM-4.1/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4140BCM-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140BCM-4.1/NOPB?
All LM4140BCM-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCM-4.1/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM4140BCM-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4140BCM-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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